Zaratite n. : A hydrous carbonate of nickel occurring as an emerald-green incrustation on chromite; -- called also emerald nickel.

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Taxonomy
Zaratite, free encyclopedia, carbonate mineral, minerals, rare secondary mineral, nickel, search, emerald green, formula, crystal system, mammillary, encrustations, vein, fillings, brittle, vitreous, hydration, alteration.

Defination from the web:
Zaratite is a bright emerald green nickel carbonate mineral with formula Ni 3C O 3(OH)4·4 ... Zaratite crystallizes in the isometric crystal system as massive to mammillary ...